Public water system · CO0103010

Active

Byers Wsd

At a glance

Byers Wsd (PWSID CO0103010) is an active community water system in Arapahoe County, Colorado. It reports serving 1,000 people through 528 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in July 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

1,000

Service connections

528

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDCO0103010

System typeCommunity water system

Activity statusActive

Population served1,000

Service connections528

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyCO state drinking water program

City served—

StateColorado

ZIP—

CountyArapahoe County

How does Byers Wsd compare with other water systems in Arapahoe County?

By EPA's size categories, Byers Wsd is a small system (501 to 3,300 people). Arapahoe County has 39 active public water systems. Its population served is well below the county average of 22,146 people per system, and accounts for 0.1% of the 863,682 people reported by systems filed under the county. Across Colorado, the 2,207 active systems average 3,400 people each. Nationally, the average active community water system reports serving 6,703 people, so Byers Wsd is well below that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Colorado has 1,068 active community water systems, 48% of the state's 2,207 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,437 Colorado systems (65%) list groundwater as their primary source.

Who owns and regulates Byers Wsd?

EPA lists Byers Wsd as owned by a local government. The CO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 17 of the 39 active systems in Arapahoe County (44%) are also owned by a local government.

Does Byers Wsd have drinking water violations?

EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in July 2025. The violations listed here began between March 2000 and July 2025. By type: 3 contaminant level above the legal limit, 3 monitoring and reporting and 1 reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 7 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.

Began	Violation	Contaminant or rule	Health-based	Status
2025-07-02	ReportingNotification, Known or Potential LSL · code 4H	Lead and Copper Rule Revisionscode 5200	No	Resolved
2009-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2006-05-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2004-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2002-11-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2001-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2000-03-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved

All 7 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Byers Wsd: frequently asked questions

Who runs Byers Wsd?

Byers Wsd (PWSID CO0103010) is a community water system owned by a local government. It is regulated by the CO state drinking water program.

How many people does Byers Wsd serve?

Byers Wsd reports serving 1,000 people through 528 service connections in Arapahoe County, Colorado.

Where does Byers Wsd get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Byers Wsd have any drinking water violations?

EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in July 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Byers Wsd's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.

Where can I find Byers Wsd's water quality report?

As a community water system, Byers Wsd must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in Arapahoe County

Water system	County	Population served	Type	Source
Aurora City of	Arapahoe	533,407	Community	Surface water
East Cherry Creek Valley Wsd	Arapahoe	66,130	Community	Purchased surface water
Englewood City of	Arapahoe	57,332	Community	Surface water
Southgate Wsd	Arapahoe	55,000	Community	Purchased surface water
Southwest Metropolitan Wsd	Arapahoe	48,648	Community	Purchased surface water
Arapahoe Cnty Wwwa	Arapahoe	31,000	Community	Groundwater

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Byers Wsd, PWSID CO0103010, Colorado”, https://aquacensus.com/water-systems/colorado/byers-wsd-co0103010 (data as of October 1, 2026).